package com.ds.common.org.expression.personrole;

import java.util.Stack;

import com.ds.common.expression.ParseException;
import com.ds.common.expression.function.Function;
import com.ds.org.OrgManager;
import com.ds.org.Role;
import com.ds.org.RoleNotFoundException;
import com.ds.server.OrgManagerFactory;

 /** 
  * 取得指定人员角色名称的角色
 * <p>Title: JDSORG组织机构中间件</p>
 * <p>Description: </p>
 * <p>Copyright: jds Copyright (c) 2003-2008</p>
 * <p>Company: www.justdos.net</p>
 * @author wenzhangli
 * @version 2.0
 */
public class GetPersonRoleByName extends Function {
	public GetPersonRoleByName() {
		numberOfParameters =1;
	}

	public void run(Stack stack) throws ParseException
	{
		checkStack(stack); // check the stack

		Object param2 = stack.pop(); 
		stack.push(perform( param2));
	}

	protected Role perform(Object param1) throws ParseException {
		if (param1 == null) {
			return null;
		}
		if (param1 instanceof String) {
			String roleName = (String)param1;
			OrgManager orgManager = OrgManagerFactory.getOrgManager();
			try {
				return orgManager.getPersonRoleByName(roleName);
			} catch (RoleNotFoundException e) {
				return null;
			}
		}
		
		throw new ParseException("Invalid parameter type in:" + this.getClass().getName() + ", param1 is " + param1.getClass().getName());  
	}
}
